Question 529772
Yiu know that
{{{i^2=-1}}} and that
{{{i^4=i^(2+2)=i^2*i^2=(-1)*(-1)=1}}}
{{{i^11=i^(4+4+2+1)=i^4*i^4*i^2*i^1=1*1*(-1)*i=-i}}}